Improvement in core-boxes



JOHN C. CHAPMAN.

improvement in Core Boxes.

Patented Feb. 6,1872.

NVENTDR.

wnwssszs) JOHN C. CHAPMAN, OF WALTHAM, MASSACHUSETTS, ASSIGNOR TO THECHAPMAN VALVE COMPANY.

IMPROVEMENT IN CORE-BOXES.

Specification forming part of Letters Patent No. 123,329, dated February6, 1872.

To all whom it may concern:

Be it known that I, JOHN C. CHAPMAN, of WValth am, in the county 01'Middlesex and State of Massachusetts, have invented an Improved Core-Boxfor Making Cores to be used in Casting Valves, of which the following isa full, clear, and exact description, reference being had to theaccompanying drawing making part of this specification, in which Figure1 is a perspective view of one-half of a core box having my improvementapplied thereto. Fig. 2 is a vertical section through the same on theline a: m of Fig. 1. Fig. 3 is a perspective view of one of theremovable pieces detached.

This invention has for its object to enable me to readily castdovetailed or other shaped recesses within the shell or body of av'alve,for the reception of a Babbitt or other softmetal seat; and consists ina core-box provided with removable pieces which, when in place, formrecesses for the reception of the material but of which the core isformed, these pieces falling out with the core, from which they can bereadily removed, leaving the core with projections of a formcorresponding to that of the recesses which are to be produced withinthe shell of the valve.

To enable others skilled in the art to understand and use my invention,I will proceed to describe the manner in which I have carried it out.

In the said drawing, A represents onehalf of a core-box, of a formsuitable for making a core to be used in casting a valve. Each side ofthe boxA is provided with a groove for the reception of a flange, a,projecting from a removable piece, B, which is thereby held in place, asseen in Fig. 1, in which position it forms one side of a groove, 0, intowhich the mol din g-sand or other material is packed when the core-boxis filled to form the core.

The removable pieces B B may be of elliptical or other form, tocorrespond to that of the exterior of the core.

When the core-box is inverted the removable pieces B B drop out with thecore, from which they may be readily removed, leaving the core withprojections of a form corresponding to that of the recesses to be castwithin the shell or body of the valve for the reception of the Babbittor other soft-metal seat.

It will be seen that by the employment of the removable pieces B B I amenabled, with great facility, to draw from its box a core provided withdovetailed projections to be used in cast-ing valves, which has notheretofore been found practicable.

Claim.

JOHN C. CHAPMAN. In presence of P. E. TESCHEMAGHER, N. W. STEARNS.

